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No. 625,|96. Patented May I6, |899. H. G. PEBCIVAL.

WHITE LEAD CHAMBER.

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(Application tiled .Tune 13, 1598.) (No Model.) 5 Sheets-Sheet 2.

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No. 625,!96. Patented My I6, |899. H. G. PERCIVAL.

WHITE LEAD CHAMBER. (Application filed June 13, 1898.) (No Model.) 5 Sheets-Shane* 3.

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Patented Hay I6, |899.V H. G. PERCIVAL.

WHITE LEAD CHAMBER.

(Application led June 13, 1898.)

5 Sheets-Sheet 4. [Lgl y (No Model.)

No. 625,|96. Patented May I6., |899. H. G. PERCIVAL.

WHITE LEAD'GHAMBER.

(Application Bled June 13, 1898.) (No Modal.)

5 Sheets-Sheet 5.

NITED? STATES PATENT OFFICE'.

HENRY GEORGE PEROIVAL, OF LONDON, ENGLAND.

WHITE-LEAD CHAMBER.

SPECIFICATION forming part of Letters Patent No. 625,196, dated May 16, 1899.

' Application led June 1S, 1898. Serial No. 683.338. (No model.)

T0 a/ZZ whom, t may concern:

Be it known that I, HENRY GEORGE Panci- VAL, a citizen of England, residing at Hythe House, Cumberland Park, London,vEngland, have invented certain new and useful 1mprovements in White-Lead Chambers, (for which application for a patent has been made ,in Great Britain, No. 12,348, dated June l,

1898,) of which the following is aspecication.

This invention relates to the construction and arrangement of chambers for the manufacture of white lead in such a manner that the process can be managed externally without exposing workmen to the deleterious atmosphere within.

The particular process for which chambers according to this invention are intended is that of subjecting metallic lead to the action of acetic-acid vapor, air moisture, and carbonic anhydrid in suitable orders and quantities at suitable temperatures; but as this process is well known no claim is'intended to be made in respect of it, but only to the construction andwarrangement of the chambers in which it is carried on, which will be described with reference to the accompanying drawings, in the several gures of which corresponding parts are denoted by like letters of reference.

Figures 1, 2, and 3 are sections on the lines l l, 2 :2, and 3 3, respectively, of Figs. 4 and 5. Fig. 4 is a plan of the licor, partly broken away to show the air-spaces and heatingpipes below it. Fig. 5 is a plan at a lower level, showing the air and gas conduits.

Under the tloor are formed mixing-chambers g, which are supplied with-air by a pipe 7L and with carbonio anhydrid by a pipe f, having two branches f opening near to the walls of the channel, which act as detlectors, causing the gas to mingle withv the air. The pipe h is supplied from an external shaft c, provided with a valve or damper c. At the same low level there are other air-pipes e, which are supplied from external shafts b and which bend upward and open into an airchamber immediately under the iioor. This chamber has 4in it rows of dwarf piers p, spanned by slabs s, which carry the `floor, consisting of slabs bedded on cement. Between the rows of piers are steam-pipes afor heating the floor and the air supplied by the -pipes e. The air-'chamber containing the steam-pipes communicates with spaces c in the side and end walls, whichare thus heated. Across the space 7cV there are fixed several short pipes t', which have openings to the exterior and interior ot' the chamber, and also lateral openings to the spaces in the walls. As any of these openings can be plugged from outside, as shown at z2, either cold orV hot air or no air can 4be admitted-by them to the chamber. The iioor of the chamber is pref-y erably made' to slope a little from the sides and ends toward the middle,'and through this floor pass pipes d, which ascend from the mixing-chambers g below and extend some distance above the tloor. Air-pipes l lead from the ceiling of the chamber to a space o in the root, whence the air andgases pass to a chimney n. Vapors are condensed in the exposed pipes Z and the liquid collects in o, whence it returns to the chamber by a pipe 0. Each of the air-pipesl is provided witha throttle-valve Z in any conveniently-accessible position. Windowsw allow inspection of the interior, and doors m serve to give access to the cham ber, these doors being tightly closed While the process goes on. The interior of the chamber is fitted with framing Q and shelves S, made of wood, to receive the trays containing the lead under treatment. The space between the adjacent curved portions of the twoarches may be filled with concrete, asshown at Y. These being charged, the doors are closed, the chamber is warmed, and the iioor is covered with al layer of acetic acid,.the vapors of which act on the lead.

Afterward air and carbonio anhydrid are admitted in quantities suitably regulated by valves or dampers, while the temperature is also regulated, as required, for the process,

all the regulation being eected outside the chamber. When the process is completed,

the chamber is thoroughly ventilated, and

then the doors can be opened to give access. for removing the white lead produced and charging the chamber again.

Having thus described the nature of this invention and the best means I know for carrying the same into practical effect, I claim A chamber for the manufacture of white lead, having an air-space beneath the iioor and air-spaces, communicating therewith, in

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from the interior of said chamber as and for 1o the purpose set forth.

In testimony whereof I have hereunto set my hand in presence of two subscribing Witnesses.

HENRY GEORGE PERCIVAL.

Witnesses:

OLIVER IMRAY, JNO. P. M. MILLARD. 

